Large Rifle/ LG Magnum Primers?

[ovastafford]

A friend of mine told me the other day that you can use large rifle primers in magnum cartridges. Is this true?

[loaders_loft]

depends. not a good idea for really harsh cold temps...

[ovastafford]

But they will work?

[Winchester 69]

Particular cartridge? Powder(s)? Temp? Work, or work better?

[ovastafford]

It is a 300 rum i was using rem 9.5 primers before and all i have is win large rifle

[4bycamper]

Originally Posted by ovastafford

But they will work?

The three calibers that I load are 7mm RM, 7mm SAUM, and 270 WSM. Now with all of this magnum stuff going on, what kind of primers do you think I use?

The long 7mm RM cases get F 210 or WLP.
The two short cases (270 WSM and 7 SAUM) get WLP or CCI-200.

In the winter I use the hotter primers and in summer the cooler ones.

I think that if my primer is not hot enough, my extreme velocity spread will increase. If my primer is too hot, I'll see more fliers.
Your mileage may differ.

Hope this helps. See what works for you.

JM .02

[bigngreen]

I nearly always try both in a cartridge, some times it gets rid of that one flyer that screws your group or your ES. I find a decent load with a mag primer then load three rounds of each primer and test, the last one I did one primer put the load at .360 one was .440 till it flung one to 1.5 then the others were 1.5in triangles, I then bought as many of the one that I could find.